Have you been hoarding those frequent-flier miles waiting for just the right occasion to use them? How about putting them to a good cause by gifting them to the Make-A-Wish Foundation, which grants wishes to children with life-threatening illnesses. The organization is commemorating World Wish Day, April 29th, with a campaign to raise dollars and airline miles for childrens' wishes involving travel. They've even launched a YouTube video explaining the program.

Each year, the foundation grants nearly 14,000 wishes—almost 75 percent of which require air travel. That means that Make-A-Wish uses 2.5 billion airline miles annually at a cost of nearly $40 million.

To continue its mission and help 10,000 children see the ocean, pet a kangaroo, or do anything else they can dream of, the organization is calling on supporters to donate some of those frequent-flier miles they've been racking up. As David Williams, president and CEO of Make-A-Wish America explains, "donating airline miles or dollars will allow us to continue creating thousands of lasting moments for children." More on World Wish Day can be found at the Make-A-Wish Foundation's official site.